Just a p.s. - talking about the happy addition of pysllium husks in LCHF/keto baking - it really does 'lighten up' the almond/coconut flour base. I have been experimenting with Keto cakes for years, and found a lighter carrot cake someone posted the link in this forum for but I cannot remember where, and it had the (1 or 2 TBSP? I think?) pysllium husks in the recipe, and sure enough - a great diabetic-friendly cake (I use my favourite stevia-granules, but less than the recipe stipulates due to gratefully lessened sweet-tooth), and yes, pretty close to carrot cakes of pre-diagnosis days... just a plug for this great baking ingredient.
Still don't know about the timing of the expelling, sorry OP, but the carrot cake, with cream cheese with a dash of lemon 'icing', disappeared into my belly pretty quickly!